Transcription of D-22:D-22(477) 7/10/09 9:56 AM Page 1 Series 477 …
1 Series 477 Digital Manometersare versa-tile, hand-held, battery operated manometersavailable in several basic ranges from 0-20 up to 0-150 psid. All models measureeither positive, negative or differential pres-sures with of full scale accuracy. Youcan select from up to nine common Englishand metric pressure units so conversions arenot necessary. A memory function allowsstorage of up to 20 readings for later recalland a backlight provides auxiliary lighting forhard-to-see locations. Also standard are ahold feature plus both visual and audible over-pressure 477 Handheld Digital ManometerSpecifications - Installation and Operating InstructionsBulletin D-22 DWYER INSTRUMENTS, INC.
2 Phone: 219/879-8000 BOX 373 MICHIGAN CITY, INDIANA 46361, Fax: 219/872-9057 e-mail: Air and compatible Materials: Consult : , 60 to 78 F ( C); from 32 to 60 F and 78 to104 F (0 to C and to 40 C).Pressure Hysteresis: of full Limits: See Limits: 0 to 140 F ( to 60 C).Compensated Temperature Limits:32 to104 F (-0 to 40 C).Storage Temperature Limits: -4 to 176 F (-20to 80 C). ( mm) 4-1/2 digit liquid :See Requirements: 9 volt alkaline included but not : oz (289 g).Connections: Two barbed connections for usewith 1/8 ( mm) or 3/16 ( mm) compression fittings for use with 1/8 ( ) x 1/4 ( mm) tubing for 477-6-FM & 477-7-FM only.
3 Agency Approvals: FM, Numberin. mm in. mm psid H20 H20 Hg Hg Pa kPa bar mbar477-1-FM477-2-FM477-3-FM477-4-FM477- 5-FM477-6-FM477-7-FM PRESSURE UNITS in. in. in. psidMetricRange0-5 kPa0-10 kPa0-50 kPa0-70 kPa0-200 kPa0-700 kPa0-1000 kPaMaximumPressure11 psi ( bar)11 psi ( bar)29 psi ( bar)58 psi ( bar)58 psi ( bar)150 psi ( bar)150 psi ( bar)D-22:D-22(477) 7/10/09 9:56 AM Page 1 INSTRUCTIONSB attery InstallationThe unit is shipped with a separate 9 volt alkaline battery which must be installed beforeoperation. Remove the two screws holding the bottom endcap in the place and remove the battery to the enclosed battery clip observing correct polarity.
4 Be careful notto trap wires between the battery, case or foam pads which retain the battery. This couldmake it difficult to install the battery or remove it later for replacement. Be sure the rubbergasket is properly seated in the gasket channel and replace endcap. Note that the endcapwill only fit one way because the holes are slightly off-center. Place the Z shaped wriststrap clip in one of the screw recesses and replace the screws. Do not overtighten. Attachwrist strap to battery replacement becomes necessary, use only a 9 volt alkaline type such as aDuracell MN1604, Eveready 522 or equivalent. Zinc-carbon types, often labeled Heavy-duty are not recommended because of the increased potential for leakage.
5 Alkaline batter-ies are also a better value because they last up to three times longer in this OperationThe on-off control is a toggle function. Press the ON/OFF key once to turn unit on; againto turn it off. If the manometer is left on with no activity for approximately 20 minutes, unitwill turn itself off to conserve the BacklightThe Model 477 includes a display backlight to allow use in the dark or in poor lightingconditions. Units must be switched off before this feature can be activated. Next, press andhold the ON/OFF key down. After about 1 second the backlight will come on and remainlighted for approximately 2 minutes after which it will turn itself off to conserve battery Pressure ReadingPotential inaccuracy due to temperature effects can be minimized by re-zeroing imme-diately before use.
6 To zero the display, vent both ports to atmosphere so no pressure isapplied to either port. Press the ZERO/STORE key and - - - - will be momentarily displayedas zeroing occurs. Zeroing is not possible when the memory mode is in use. It must be donebefore selecting that the unit is accidently zeroed with pressure applied to one of the ports, internal circuit-ry might detect an error and display ALARM 1 or ALARM 2 at the top of the readout , if the ports are then vented, the audible overpressure alarm may sound con-tinuously. This will not normally cause harm it the maximum pressure has not been exceed-ed. To correct the fault, vent the pressure ports to atmosphere and press the ZERO/STOREkey to zero the unit.
7 The fault will then be :D-22(477) 7/10/09 9:56 AM Page 2 Pressure ConnectionsDual size barbed connections are provided to fit both 1/8 and 3/16 rubber or vinyl tub-ing. For a single positive pressure, connect tubing to port marked + and vent opposite portto atmosphere. For a single negative pressure (vacuum), connect tubing to port marked -and vent opposite port to atmosphere. To measure differential pressure, connect higherpressure to port marked + and lower pressure to port marked -. Manometer will indicate thedifference between the Pressure UnitsUp to nine pressure units are available. The display will indicate the current selection. Tochange to different units, use the UNITS/LOC key.
8 Each touch will cause an advance to thenext choice. The selected units will remain in memory even when power is shut off. Thisway, your preference will always be displayed after the initial HoldThere may be situations where you want to temporarily retain a reading. The Model 477includes a Display Hold feature which freezes the current reading and holds it in the displayuntil cleared. To activate this operation, momentarily press the HOLD/MEMORY key whenthe pressure you want to save is displayed. A HOLD indicator will appear in the display toindicate that the reading shown is frozen. To return to normal operation, press theHOLD/MEMORY key HOLD indicator will disappear and the current pressure willagain be FunctionA memory function is included in the Model 477 that allows you to store up to 20 pres-sure readings for later review or recording.
9 This feature is especially valuable for making atraverse of duct velocity pressures with a Pitot tube or for multipoint pressure measure-ments. The readings are stored in non-volatile memory so they will be retained even if theunit is shut off or the battery is Memory ModeTo enter the memory mode, press and hold the HOLD/MEMORY key until the MEM indi-cator appears in the display. The key can then be released. The active memory location willbe shown in the small lower left numeric display. Initially it will read Pressure ReadingsTo store a reading, press the ZERO/STORE key. The reading will be stored under theindicated memory location and a beep will sound indicating that the reading has beensaved.
10 As each reading is saved the memory location display will advance to the next num-ber. Note that in the memory mode, the display zero function is not available. To zero thedisplay, you must first exit the memory mode and then press the ZERO/STORE :D-22(477) 7/10/09 9:56 AM Page 3 Copyright 2009 Dwyer Instruments, in 7/09 FR#02-440861-00 Rev. 4 Viewing Stored Readings - Selecting a LocationTo view the contents of memory the unit must first be in the memory mode. The currentpressure is not displayed. To distinguish the memory display from a current reading, the HOLD indicator will be shown. Each time the UNITS/LOC key is pressed, the memory location willadvance to the next stored reading.
